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AIS - Automatic Identification System
(AIS) settings and preferences

The Automatic Identification System (AIS) is a short range coastal tracking system used on ships and by Vessel Traffic Services (VTS) for identifying and locating vessels by electronically exchanging data with other nearby ships and VTS stations. Information such as unique identification, position, course, and speed can be displayed on a screen or an ECDIS. AIS is intended to assist the vessel's watch-standing officers and allow maritime authorities to track and monitor vessel movements, and integrates a standardized VHF transceiver system such as a LORAN-C or Global Positioning System receiver, with other electronic navigation sensors, such as a gyrocompass or rate of turn indicator.  [AIS description courtesy:].


The Plotter's AIS function makes it is easy to interrogate targets, see other vessel's courses etc. It will calculate and display CPA and TCPA.


The following is a list of colours and shapes of AIS targets:

Colour / Shape


Dangerous target, as per CPA & TCPA calculation
Basic AIS info received (MMSI, COG, SOG, navigational status., etc)
Extended info received (basic plus name, callsign, destination ....)
An X across the target
This defines an "Old" target, the last info received is older than the the value defined in "Mark target lost after (Minutes)" in the AIS configuration dialog.
blue square with target
AIS Class B target





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